One thing with the modified code is that it is necessary to add an attachment to send an HTML format mail (it returns the error “not enough arguments” otherwise).
To change that and be able to send only HTML text, a simple copy of the argument parsing code from the “sendmail” function to the “sendEmail” function works.

Here is the modified code:

function sendEmail(to, subject, theMessage, attachments)
%SENDEMAIL Send e-mail wrapper (with HTML formatting)
% Argument parsing.
  narginchk(2,4);
  if ischar(to)
    to = {to};
  end
  if (nargin < 3)
    theMessage = '';
  end
  if (nargin < 4)
    attachments = [];
  elseif ischar(attachments)
    attachments = {attachments};
  end
  endmail(to, subject, theMessage, attachments);

I hope it will be useful!

Cheers